Hello. I have a U3V50AHV step up regulator which I want to use to drive a DC motor up to 14 V from a 3.7 LiIon battery.
I want to mount an external potentiometer instead of the onboard trimmer, I saw on the forum that the value is 100K or 50K.
My problem is that I want to limit the maximum output to 15 V and use the entire range of the potentiometer. How can I do this? Can I solve the problem only with the potentiometer or do I need an external voltage divider?
PS: a second question concerns the input voltage: I have two choices: to use a 3.7 V battery or the 5V output of another step-up (typical USB charger circuit). Would it be a problem to use the 5V stepped up voltage? Should I stick better with the “real” 3.7 V?